DC motor assembly and DC motor

Abstract

The present invention discloses a DC motor assembly and a DC motor, relating to the field of DC motors, which includes a rotor and a stator arranged outside the rotor. Both ends of the rotor are provided with rotating shafts, and a commutator is sleeved outside one of the rotating shafts; a carbon brush unit, which is composed of a carbon brush holder, a carbon brush, a positioning structure for stabilizing the carbon brush, and an elastic structure for making the carbon brush contact with the commutator. A locking jack is arranged on the side surface of the carbon brush holder; a locking unit, which includes a control rod and a movable rod; the present invention restricts the carbon brush from the side through the positioning structure, thereby effectively preventing the carbon brush from shaking, effectively ensuring that the carbon brush does not deviate from the center line, and the insulating roller and the carbon brush are in rolling friction, which is beneficial to the replacement operation of the carbon brush; through the locking unit, two carbon brush holders can be fixed simultaneously, and when used in cooperation with the ejecting unit, the two carbon brush holders can also be ejected simultaneously, so that the carbon brush can be replaced very conveniently, saving time.

Description

Technical Field

[0001] The present invention relates to the technical field of DC motors, specifically to a DC motor assembly and a DC motor. Background Art

[0002] A DC motor refers to a rotating electric machine that converts DC electrical energy into mechanical energy or converts mechanical energy into DC electrical energy. When operating as a motor, it is a DC motor that converts electrical energy into mechanical energy; when operating as a generator, it is a DC generator that converts mechanical energy into electrical energy.

[0003] Currently, the carbon brushes of a DC motor need to be positioned by brush holder slots, and the brush holder slots cooperate with carbon brush springs to keep the carbon brushes in good contact with the commutator. However, in order to facilitate the replacement of the carbon brushes, there will inevitably be a gap between the brush holder slots and the carbon brushes. Coupled with the elastic force of the carbon brush springs, it is easy for the carbon brushes to deviate from the center line when installing the carbon brushes, and the vibration generated during the operation of the motor will also cause the carbon brushes to shake, resulting in poor contact between the carbon brushes and the commutator. Summary of the Invention

[0004] To solve the defects existing in the prior art, the present invention provides a DC motor assembly and a DC motor.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] The DC motor assembly of the present invention includes a rotor and a stator provided outside the rotor. Rotating shafts are provided at both ends of the rotor, and a commutator is sleeved on one of the rotating shafts.

[0007] A carbon brush unit, which is composed of a carbon brush holder, a carbon brush, a positioning structure for stabilizing the carbon brush, and an elastic structure for making the carbon brush contact the commutator. A locking jack is provided on the side of the carbon brush holder.

[0008] A locking unit, including a control rod and a movable rod. Locking plugs inserted into the locking jacks are provided at both ends of the movable rod.

[0009] An ejecting unit for ejecting the carbon brush holder.

[0010] As a preferred technical solution of the present invention, the positioning structure includes two transmission brackets arranged face to face and a tension spring for connecting the two transmission brackets. One end of the transmission bracket is connected with a mounting plate, an insulating roller for preventing the carbon brush from shaking is rotatably arranged on the mounting plate, and an avoidance groove is provided at the bottom of the transmission bracket. A T-shaped through hole is also provided on the transmission bracket.

[0011] As a preferred technical solution of the present invention, the elastic structure includes an adjusting plate and an adjusting screw rod rotatably arranged on one side of the adjusting plate. A positioning guide post is arranged on the other side of the adjusting plate, and a carbon brush spring connected to the adjusting plate is sleeved outside the positioning guide post.

[0012] As a preferred technical solution of the present invention, an installation groove one slidably matched with the adjusting plate is opened on the carbon brush holder. One end of the installation groove one is communicated with a connection hole matched with the adjusting screw rod, and the other end of the installation groove one is communicated with an installation groove two for installing a carbon brush. Two installation grooves three for accommodating the installation plate are communicated outside the installation groove two, and a conductor in contact with the carbon brush is embedded at the bottom of the installation groove two.

[0013] As a preferred technical solution of the present invention, a U-shaped groove for installing a transmission bracket is opened at the bottom of the carbon brush holder. The upper end of the U-shaped groove is communicated with the installation groove two, and two groups of positioning chutes are communicated at the bottom of the U-shaped groove. A support guide rod slidably matched with the T-shaped through hole is arranged in the U-shaped groove. The support guide rod penetrates through the carbon brush holder, and limit blocks are arranged at both ends of the support guide rod.

[0014] As a preferred technical solution of the present invention, the control rod member includes a control cap, a control rod connected to the control cap, and a transmission sleeve sleeved outside the control rod. 2N L-shaped fitting grooves are opened at one end of the transmission sleeve. Fitting blocks matched with the L-shaped fitting grooves are symmetrically arranged on the outer wall of the control rod, and an extrusion ring plate is fixedly sleeved at one end of the control rod;

[0015] A return spring is also sleeved on the outer wall of the control rod. The return spring is located between the transmission sleeve and the extrusion ring plate, and one end of the control rod is rotatably connected to the movable rod through a bearing.

[0016] As a preferred technical solution of the present invention, a limiting rod is arranged at one end of the locking plug rod, and a compression spring is sleeved on the outer wall of the limiting rod.

[0017] As a preferred technical solution of the present invention, the ejecting unit includes a cam sleeved and fixed outside the transmission sleeve, two movable plates in contact with the cam, and at least two connecting springs for connecting the movable plates. A guide groove is opened at one end of the movable plate, and an L-shaped transmission rod is installed at the other end. Two top plates are arranged at the end of the L-shaped transmission rod far from the movable plate.

[0018] A DC motor includes a motor housing for installing a stator and the above-mentioned DC motor assembly. An end cover one and an end cover two are respectively arranged at both ends of the motor housing. An assembly opening for installing a carbon brush holder is opened on the end cover two. A support bracket for supporting the carbon brush holder is also arranged inside the end cover two. A long conductor in contact with the bottom of the conductor is arranged on the support bracket, and a cable is connected to the long conductor;

[0019] The support bracket is symmetrically provided with positioning guide rods that are slidably engaged with the positioning chutes. The support bracket is also provided with through holes that are slidably engaged with the locking insertion rods, and the two rotating shafts are rotatably connected to the first end cap and the second end cap through bearings respectively.

[0020] As a preferred technical solution of the present invention, the second end cap is further provided with an installation opening for installing the control rod member. The installation opening is rotatably connected to the transmission sleeve through a bearing, and two support columns arranged face to face are further provided inside the second end cap. A guide rod slidably engaged with the guide groove is arranged between the two support columns. The support column is further provided with a receiving hole for receiving the limiting rod, and the compression spring is located between the support column and the movable rod.

[0021] The beneficial effects of the present invention are:

[0022] 1. For this kind of DC motor assembly and DC motor, by squeezing the insulating roller with the carbon brush, the insulating roller drives the mounting plate to move into the third mounting groove. The mounting plate drives the transmission bracket, further stretching the tension spring. At the same time, the insulating roller will abut against the carbon brush by means of the elastic force of the tension spring, restricting the carbon brush from the side, so as to effectively prevent the carbon brush from shaking, effectively ensuring that the carbon brush does not deviate from the center line. Moreover, the insulating roller and the carbon brush are in rolling friction, which is beneficial to the replacement operation of the carbon brush.

[0023] 2. For this kind of DC motor assembly and DC motor, by rotating the adjusting screw rod to adjust the position of the adjusting plate, not only can the elastic force of the carbon brush spring be adjusted, but also the position of the carbon brush spring can be changed, effectively avoiding the situation that the carbon brush cannot maintain good contact with the commutator due to the insufficient length of the carbon brush spring after the carbon brush wears, thus extending the service life of the carbon brush.

[0024] 3. For this kind of DC motor assembly and DC motor, by pulling the control cap outwards, the control rod drives the engaging block into the L-shaped engaging groove. The control rod drives the movable rod and squeezes the return spring and the compression spring, causing the locking insertion rod to retract into the through hole. Then, rotate the control rod, and the L-shaped engaging groove locks the engaging block to lock the control rod. After the carbon brush holder is installed, rotate the control rod in the reverse direction to complete the unlocking. Driven by the elastic forces of the return spring and the compression spring, the locking insertion rod is inserted into the locking jack to fix the carbon brush holder. Two carbon brush holders can be fixed simultaneously. When used in cooperation with the ejection unit, the two carbon brush holders can also be ejected simultaneously, making it very convenient to replace the carbon brush and saving time.

[0025] 4. In this kind of DC motor assembly and DC motor, the control rod is locked by clamping the mating block through the L-shaped mating groove. Therefore, the transmission sleeve can be driven by rotating the control rod, and the cam can be driven to rotate by the transmission sleeve. When the contact part between the cam and the movable plate changes from the short end to the long end, the movable plate is pushed by the cam to move the two movable plates away from each other. The movable plate drives the top plate by means of the L-shaped transmission rod, and the carbon brush holder is pushed out by the moving top plate. When the control rod is not locked, rotating the control cap will not drive the transmission sleeve, which can effectively prevent the carbon brush holder from being pushed out due to misoperation and is more reliable.

[0026] 5. In this kind of DC motor assembly and DC motor, the elastic force provided by the return spring and the compression spring enables the locking plug rod to be stably inserted into the locking jack, thereby improving the stability of the installation of the carbon brush holder. After the control rod is unlocked, the locking plug rod can be driven back to its original position by the elastic force of the return spring and the compression spring. Brief Description of the Drawings

[0027] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0028] Figure 1 is a schematic structural diagram of the DC motor assembly and DC motor of the present invention;

[0029] Figure 2 is a schematic internal structural diagram of the housing of the DC motor assembly and DC motor of the present invention;

[0030] Figure 3 is a schematic internal structural diagram of the second end cover of the DC motor assembly and DC motor of the present invention;

[0031] Figure 4 is a schematic internal structural diagram of the second end cover (omitting the carbon brush unit) of the DC motor assembly and DC motor of the present invention;

[0032] Figure 5 is a schematic structural diagram of the second end cover of the DC motor assembly and DC motor of the present invention;

[0033] Figure 6 is a schematic first perspective structural diagram of the carbon brush unit of the DC motor assembly and DC motor of the present invention;

[0034] Figure 7 is a schematic second perspective structural diagram of the carbon brush unit of the DC motor assembly and DC motor of the present invention;

[0035] Figure 8 is a schematic structural diagram of the positioning structure and elastic structure of the DC motor assembly and DC motor of the present invention;

[0036] Figure 9It is a schematic diagram of the first perspective structure of the carbon brush holder of the DC motor assembly and the DC motor of the present invention;

[0037] Figure 10 It is a schematic diagram of the second perspective structure of the carbon brush holder of the DC motor assembly and the DC motor of the present invention;

[0038] Figure 11 It is a schematic diagram of the first perspective structure of the ejecting unit and the locking unit of the DC motor assembly and the DC motor of the present invention;

[0039] Figure 12 It is a schematic diagram of the second perspective structure of the ejecting unit and the locking unit of the DC motor assembly and the DC motor of the present invention;

[0040] Figure 13 It is a schematic diagram of the third perspective structure of the ejecting unit and the locking unit of the DC motor assembly and the DC motor of the present invention;

[0041] Figure 14 It is a schematic diagram of the control rod structure of the DC motor assembly and the DC motor of the present invention;

[0042] Figure 15 It is a three-dimensional sectional view of the transmission sleeve of the DC motor assembly and the DC motor of the present invention.

[0043] In the figure: 1, rotor; 2, stator; 3, commutator; 4, rotating shaft; 5, carbon brush unit; 51, carbon brush holder; 511, insertion hole; 512, positioning chute; 513, locking insertion hole; 514, conductor; 515, C-shaped groove; 516, mounting groove two; 517, mounting groove three; 52, carbon brush; 53, cover plate; 54, elastic structure; 541, carbon brush spring; 542, positioning guide post; 543, adjusting screw; 544, adjusting plate; 55, transmission bracket; 551, avoidance groove; 56, tension spring; 57, mounting plate; 58, insulating roller; 59, support guide rod; 591, limit stop block; 6, ejecting unit; 61, movable plate; 62, connecting spring; 63, cam; 64, L-shaped transmission rod; 65, top plate; 7, locking unit; 71, movable rod; 72, locking insertion rod; 73, limit rod; 74, compression spring; 75, transmission sleeve; 751, L-shaped mating groove; 76, extrusion ring plate; 77, control rod; 771, mating block; 78, control cap; 79, return spring; 8, housing; 9, end cover two; 91, support bracket; 92, assembly port; 93, support column; 94, long conductor; 95, through hole; 96, guide rod; 10, end cover one. Detailed Embodiments

[0044] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0045] Embodiment: As Figure 1-4 , Figure 6 and Figure 11 shown, the DC motor assembly of the present invention includes a rotor 1 and a stator 2 disposed outside the rotor 1. Rotating shafts 4 are provided at both ends of the rotor 1, and a commutator 3 is sleeved outside one of the rotating shafts 4;

[0046] The carbon brush unit 5 is composed of a carbon brush holder 51, a carbon brush 52, a positioning structure for stabilizing the carbon brush 52, and an elastic structure 54 for bringing the carbon brush 52 into contact with the commutator 3. A locking insertion hole 513 is provided on the side surface of the carbon brush holder 51;

[0047] The locking unit 7 includes a control rod and a movable rod 71. Locking insertion rods 72 inserted into the locking insertion holes 513 are provided at both ends of the movable rod 71;

[0048] An ejecting unit 6 for ejecting the carbon brush holder 51.

[0049] Among them, as Figure 6-8 shown, the positioning structure includes two transmission brackets 55 arranged face to face and a tension spring 56 for connecting the two transmission brackets 55. One end of the transmission bracket 55 is connected with a mounting plate 57. An insulating roller 58 for preventing the carbon brush 52 from shaking is rotatably provided on the mounting plate 57. An avoidance groove 551 is provided at the bottom of the transmission bracket 55, and a T-shaped through hole is also provided on the transmission bracket 55.

[0050] After the carbon brush 52 is installed in the second installation groove 516, the insulating roller 58 is squeezed to drive the mounting plate 57 to move into the third installation groove 517. The transmission bracket 55 is driven by the mounting plate 57 to further stretch the tension spring 56. At the same time, the insulating roller 58 will abut against the carbon brush 52 by means of the elastic force of the tension spring 56, restricting the carbon brush 52 from the side, so as to effectively prevent the carbon brush 52 from shaking, effectively ensure that the carbon brush 52 does not deviate from the center line, and the insulating roller 58 and the carbon brush 52 are in rolling friction, which is beneficial to the replacement operation of the carbon brush 52.

[0051] Among them, as Figure 6 and Figure 8 shown, the elastic structure 54 includes an adjusting plate 544 and an adjusting screw 543 rotatably provided on one side of the adjusting plate 544. A positioning guide post 542 is provided on the other side of the adjusting plate 544. A carbon brush spring 541 connected to the adjusting plate 544 is sleeved outside the positioning guide post 542. The positioning guide post 542 plays a role in positioning the carbon brush spring 541, which is beneficial to the later replacement of the carbon brush spring 541.

[0052] The position adjustment of the adjusting plate 544 is realized by rotating the adjusting screw 543. This can not only adjust the elastic force of the carbon brush spring 541, but also change the position of the carbon brush spring 541, effectively avoiding the situation where the carbon brush 52 cannot maintain good contact with the commutator 3 due to the insufficient length of the carbon brush spring 541 after the carbon brush 52 wears, thereby extending the service life of the carbon brush 52.

[0053] Among them, as Figure 7 , Figure 9 and Figure 10 shown, an installation groove 1 is provided on the carbon brush holder 51 and is in sliding fit with the adjusting plate 544. One end of the installation groove 1 is communicated with a connection hole that cooperates with the adjusting screw 543. The other end of the installation groove 1 is communicated with an installation groove 2 516 for installing the carbon brush 52. Two installation grooves 3 517 for accommodating the mounting plate 57 are communicated outside the installation groove 2 516. And a conductor 514 in contact with the carbon brush 52 is embedded at the bottom of the installation groove 2 516. The conductor 514 is used to conduct current from the long conductor 94 to the carbon brush 52; the installation groove 1 can provide an installation space for the adjusting plate 544 and the carbon brush spring 541.

[0054] In this embodiment, the connection hole is composed of a threaded hole screwed with the adjusting screw 543 and a sliding hole that can accommodate the head of the adjusting screw 543. The cross-sectional shape of the connection hole is T-shaped. The provided sliding hole facilitates the rotational movement of the adjusting screw 543 and provides sufficient space for the adjusting screw 543 to move into the carbon brush holder 51.

[0055] In this embodiment, a plug hole 511 is also provided at the top of the carbon brush holder 51. A detachable cover plate 53 is provided at the top of the installation groove 1. A plug-in member that is plugged into the plug hole 511 is provided at the bottom of the cover plate 53. The cover plate 53 is installed on the carbon brush holder 51 through the plug-in connection between the plug-in member and the plug hole 511, making the cover plate 53 easy to disassemble and facilitating the repair or replacement of the elastic structure 54.

[0056] Among them, as Figure 8 and Figure 9 shown, a U-shaped groove 515 for installing the transmission bracket 55 is provided at the bottom of the carbon brush holder 51. The upper end of the U-shaped groove 515 is communicated with the installation groove 2 516. Two groups of positioning chutes 512 are communicated at the bottom of the U-shaped groove 515. And a support guide rod 59 that is in sliding fit with the T-shaped through hole is provided in the U-shaped groove 515. The support guide rod 59 penetrates through the carbon brush holder 51. Limit blocks 591 are provided at both ends of the support guide rod 59. The provided limit blocks 591 play a limiting role on the transmission bracket 55; through the sliding fit between the support guide rod 59 and the T-shaped through hole, the deviation of the moving direction of the transmission bracket 55 can be effectively avoided.

[0057] Among them, as Figure 11 , Figure 14and Figure 15 As shown, the control rod member includes a control cap 78, a control rod 77 connected to the control cap 78, and a transmission sleeve 75 sleeved outside the control rod 77. One end of the transmission sleeve 75 is provided with 2N L-shaped fitting grooves 751. Symmetrically arranged on the outer wall of the control rod 77 are fitting blocks 771 that cooperate with the L-shaped fitting grooves 751. One end of the control rod 77 is fixedly sleeved with a pressing ring plate 76. Through the cooperation of the provided pressing ring plate 76 and the transmission sleeve 75, the return spring 79 can be jointly pressed; the fitting block 771 can be clamped by the L-shaped fitting groove 751, thereby realizing the locking of the control rod 77;

[0058] A return spring 79 is further sleeved on the outer wall of the control rod 77. The return spring 79 is located between the transmission sleeve 75 and the pressing ring plate 76. One end of the control rod 77 is rotatably connected to the movable rod 71 through a bearing.

[0059] By pulling the control cap 78 outwards, the control rod 77 drives the fitting block 771 into the L-shaped fitting groove 751. The control rod 77 drives the movable rod 71 and presses the return spring 79 and the compression spring 74, so that the locking plug 72 retracts into the through hole 95. Then the control rod 77 is rotated. The fitting block 771 is clamped by the L-shaped fitting groove 751 to lock the control rod 77. Then the carbon brush holder 51 with the carbon brush 52 is inserted from the assembly port 92. After that, the control rod 77 is rotated in the reverse direction to complete the unlocking. Driven by the elastic force of the return spring 79 and the compression spring 74, the locking plug 72 is inserted into the locking jack 513 to complete the fixation of the carbon brush holder 51. Two carbon brush holders 51 can be fixed simultaneously;

[0060] When the carbon brush holder 51 needs to be removed, the control rod 77 is operated to make the locking plug 72 disengage from the locking jack 513. Then the control rod 77 is locked. After that, the control rod 77 is continuously rotated. The control rod 77 will drive the transmission sleeve 75 to rotate. The transmission sleeve 75 drives the cam 63 to rotate, and the ejecting unit 6 starts to operate. The two carbon brush holders 51 are simultaneously ejected from the assembly port 92 through the ejecting unit 6, so that the operator can conveniently remove the carbon brush holder 51. The provided locking unit 7 can not only fix two carbon brush holders 51 simultaneously, but also eject the two carbon brush holders 51 simultaneously when used in cooperation with the ejecting unit 6, so that the carbon brush 52 can be replaced very conveniently. When the control rod 77 is not locked, rotating the control cap 78 will not drive the transmission sleeve 75, which can effectively prevent the carbon brush holder 51 from being ejected due to misoperation, and is more reliable.

[0061] In this embodiment, marks can be set on both the control cap 78 and the transmission sleeve 75, such as arrow marks. The mark on the control cap 78 corresponds to the fitting block 771, and the mark on the transmission sleeve 75 corresponds to the L-shaped fitting groove 751, which is conducive to the operator aligning the fitting block 771 with the L-shaped fitting groove 751. At the same time, angle marks are set on the installation port to facilitate the operator to determine the rotation angle.

[0062] Among them, as Figure 11-13 shown, one end of the locking plug 72 is provided with a limiting rod 73, and a compression spring 74 is sleeved on the outer wall of the limiting rod 73. The elastic force provided by the compression spring 74 enables the locking plug 72 to be stably inserted into the locking jack 513. After the control rod 77 is unlocked, the elastic forces of the return spring 79 and the compression spring 74 can drive the locking plug 72 back to its original position.

[0063] Among them, as Figure 11-13 shown, the ejection unit 6 includes a cam 63 sleeved and fixed outside the transmission sleeve 75, two movable plates 61 in contact with the cam 63, and at least two connecting springs 62 for connecting the movable plates 61. One end of the movable plate 61 is provided with a guiding groove, and the other end is provided with an L-shaped transmission rod 64. Two top plates 65 are provided at the end of the L-shaped transmission rod 64 away from the movable plate 61.

[0064] The transmission sleeve 75 drives the cam 63 to rotate. During the process that the contact part between the cam 63 and the movable plate 61 changes from the short end to the long end, the cam 63 pushes the movable plate 61 to make the two movable plates 61 move away from each other. The movable plate 61 drives the top plate 65 by means of the L-shaped transmission rod 64, and the carbon brush holder 51 is ejected by the moving top plate 65.

[0065] In this embodiment, the two ends of the connecting spring 62 are respectively connected to the support column 93 and the movable plate 61. During the rotation of the cam 63, when the contact part between the cam 63 and the movable plate 61 changes from the long end to the short end, the elastic force of the connecting spring 62 drives the movable plate 61 so that the movable plate 61 can always be in contact with the cam 63.

[0066] As Figure 1-5 shown, the DC motor includes a motor housing 8 for installing the stator 2 and the above-mentioned DC motor assembly. End covers one 10 and end cover two 9 are respectively provided at both ends of the motor housing 8. An assembly port 92 for installing the carbon brush holder 51 is opened on the end cover two 9. A support bracket 91 for supporting the carbon brush holder 51 is further provided inside the end cover two 9. A long conductor 94 in contact with the bottom of the conductor 514 is provided on the support bracket 91, and a cable is connected to the long conductor 94; the conduction of current is realized through the long conductor 94 in contact with the bottom of the conductor 514; the assembly port 92 is used for assembling the carbon brush holder 51, and the carbon brush holder 51 is positioned in cooperation with the support bracket 91 capable of supporting the carbon brush holder 51.

[0067] The support bracket 91 is symmetrically provided with positioning guide rods that are slidably engaged with the positioning chute 512. The support bracket 91 is also provided with a through hole 95 that is slidably engaged with the locking plug 72. The two rotating shafts 4 are rotatably connected to the first end cap 10 and the second end cap 9 through bearings respectively. The through hole 95 serves to guide the locking plug 72, which is beneficial for the locking plug 72 to align with the locking hole 513.

[0068] In this embodiment, through the sliding fit between the positioning guide rods and the positioning chute 512, the carbon brush holder 51 can be quickly assembled onto the second end cap 9.

[0069] In this embodiment, the second end cap 9 is provided with a cable hole for leading out the cable, which is convenient for wiring.

[0070] Among them, as Figure 3 and Figure 4 shown, the second end cap 9 is further provided with an installation opening for installing the control rod member. The installation opening is rotatably connected to the transmission sleeve 75 through a bearing. The second end cap 9 is also provided with two support columns 93 arranged face to face. A guide rod 96 that is slidably engaged with the guide groove is provided between the two support columns 93. The support column 93 is also provided with a receiving hole for receiving the limiting rod 73, and the compression spring 74 is located between the support column 93 and the movable rod 71. By the support column 93 and the movable rod 71 squeezing the compression spring 74, the locking plug 72 is stably inserted into the locking hole 513 by the elastic force of the compression spring 74, thereby improving the stability of the installation of the carbon brush holder 51.

[0071] In this embodiment, the receiving hole can receive the limiting rod 73, providing space for the movement of the limiting rod 73. Through the sliding fit between the guide rod 96 and the guide groove, the movable plate 61 can be guided to prevent the moving direction of the movable plate 61 from deviating, so that the ejecting unit 6 can operate more stably.

[0072] During operation, the carbon brush 52 is loaded into the second installation groove 516. The insulating roller 58 is squeezed and moves into the third installation groove 517, causing the mounting plate 57 to drive the transmission bracket 55, and further stretching the tension spring 56. At the same time, the insulating roller 58 will abut against the carbon brush 52 by the elastic force of the tension spring 56, restricting the carbon brush 52 from the side. By rotating the adjusting screw 543, the position of the adjusting plate 544 can be adjusted, which can not only adjust the elastic force of the carbon brush spring 541, but also change the position of the carbon brush spring 541, effectively avoiding the situation that the carbon brush 52 cannot maintain good contact with the commutator 3 due to the insufficient length of the carbon brush spring 541 after the carbon brush 52 is worn.

[0073] Insert the carbon brush holder 51 from the assembly port 92, and then operate the control lever 77 to insert the locking plug 72 into the locking socket 513 to complete the fixation of the carbon brush holder 51. When it is necessary to remove the carbon brush holder 51, operate the control lever 77 to disengage the locking plug 72 from the locking socket 513, then lock the control lever 77, and then continue to rotate the control lever 77. The control lever 77 will drive the transmission sleeve 75 to rotate, drive the cam 63 to rotate through the transmission sleeve 75, and the ejection unit 6 starts to operate. The two carbon brush holders 51 are ejected from the assembly port 92 at the same time through the ejection unit 6, and then the operator can easily pull out the carbon brush holder 51.

[0074] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A DC motor assembly, characterized in that: Comprising: A rotor (1) and a stator (2) provided outside the rotor (1). Both ends of the rotor (1) are provided with rotating shafts (4), and a commutator (3) is sleeved outside one of the rotating shafts (4); A carbon brush unit (5), which consists of a carbon brush holder (51), carbon brushes (52), a positioning structure, and an elastic structure (54). A locking jack (513) is opened on the side of the carbon brush holder (51). The positioning structure includes two transmission brackets (55) and a tension spring (56) for connecting the two transmission brackets (55). One end of the transmission bracket (55) is connected with a mounting plate (57), and an insulating roller (58) is rotatably arranged on the mounting plate (57); An installation groove one is opened on the carbon brush holder (51). One end of the installation groove one is communicated with a connection hole, and the other end of the installation groove one is communicated with an installation groove two (516) for installing the carbon brush (52). Two installation grooves three (517) for accommodating the mounting plate (57) are communicated outside the installation groove two (516), and a conductor (514) in contact with the carbon brush (52) is embedded at the bottom of the installation groove two (516); A U-shaped groove (515) for installing the transmission bracket (55) is opened at the bottom of the carbon brush holder (51). The upper end of the U-shaped groove (515) is communicated with the installation groove two (516), and two groups of positioning chutes (512) are communicated at the bottom of the U-shaped groove (515); A locking unit (7), which includes a control rod and a movable rod (71). Locking plug rods (72) inserted into the locking jacks (513) are provided at both ends of the movable rod (71). A limiting rod (73) is provided at one end of the locking plug rod (72), and a compression spring (74) is sleeved on the outer wall of the limiting rod (73); The control rod includes a control cap (78), a control rod (77) connected to the control cap (78), and a transmission sleeve (75) sleeved outside the control rod (77); A jacking unit (6) for jacking out the carbon brush holder (51).

2. The DC motor assembly according to claim 1, characterized in that: An avoidance groove (551) is opened at the bottom of the transmission bracket (55), and a T-shaped through hole is also opened on the transmission bracket (55).

3. The DC motor assembly according to claim 1, characterized in that: The elastic structure (54) includes an adjusting plate (544) slidably matched with the installation groove one and an adjusting screw (543) rotatably arranged on one side of the adjusting plate (544) and matched with the connection hole. A positioning guide post (542) is provided on the other side of the adjusting plate (544), and a carbon brush spring (541) connected to the adjusting plate (544) is sleeved on the outer wall of the positioning guide post (542).

4. The DC motor assembly according to claim 1, characterized in that: A support guide rod (59) slidably matched with the T-shaped through hole is arranged in the U-shaped groove (515). The support guide rod (59) penetrates through the carbon brush holder (51), and limiting blocks (591) are provided at both ends of the support guide rod (59).

5. The DC motor assembly according to claim 1, characterized in that: 2N L-shaped mating grooves (751) are opened at one end of the transmission sleeve (75). Mating blocks (771) matched with the L-shaped mating grooves (751) are symmetrically provided on the outer wall of the control rod (77), and an extrusion ring plate (76) is fixedly sleeved at one end of the control rod (77); A return spring (79) is sleeved on the outer wall of the control rod (77), and the return spring (79) is located between the transmission sleeve (75) and the extrusion ring plate (76). One end of the control rod (77) is rotatably connected to the movable rod (71) via a bearing.

6. The DC motor assembly according to claim 1, characterized in that: The ejection unit (6) comprises a cam (63) sleeved and fixed outside a transmission sleeve (75), two movable plates (61) in contact with the cam (63), and at least two connecting springs (62) for connecting the movable plates (61); a guide groove is provided at one end of the movable plate (61), and an L-shaped transmission rod (64) is installed at the other end; and two ejector plates (65) are provided at one end of the L-shaped transmission rod (64) away from the movable plate (61).

7. A DC motor, comprising a housing (8) for mounting a stator (2) and a DC motor assembly according to any one of claims 1 to 6, characterized in that: The two ends of the housing (8) are respectively provided with an end cover 1 (10) and an end cover 2 (9); the end cover 2 (9) is provided with an assembly opening (92) for mounting a carbon brush holder (51); the end cover 2 (9) is also provided with a support bracket (91) for supporting the carbon brush holder (51); the support bracket (91) is provided with a long conductor (94) in contact with the bottom of the conductor (514); and the long conductor (94) is connected with a cable; The support bracket (91) is symmetrically provided with positioning guide rods that are slidably matched with the positioning slide groove (512), and the support bracket (91) is also provided with a through hole (95) that is slidably matched with the locking plug rod (72), and the two rotating shafts (4) are rotatably connected to the end cover 1 (10) and the end cover 2 (9) respectively through bearings.

8. The DC motor according to claim 7, characterized in that: The second end cover (9) is also provided with an installation opening for installing a control rod, the installation opening is rotatably connected to the transmission sleeve (75) via a bearing, and the second end cover (9) is also provided with two support columns (93) arranged face to face, a guide rod (96) slidably engaged with the guide groove is provided between the two support columns (93), and a receiving hole for accommodating the limit rod (73) is also provided on the support column (93), and a compression spring (74) is located between the support column (93) and the movable rod (71).

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